Glass Thickness Gauge Measuring Tool 1/16" to 1" Reflection Imperial

I bought it to verify the glass thickness and air gap for new double-pane windows we ordered. Works great--hold it up to the window on the bevel, and look at the reflection. Very cool.

This is cool! No other way to explain it but cool. Love it!

Shadow line does not show up rendering the product worthless.

this crap doesn't work like they say it does. dont waist your money, it doesn't cost much but go get an ice cream you will enjoy it better

To all the bad reviews on the glass thickness gauge, it's all on you people. There is a way to use these things. First of all, depending which unit of measurements you're using, you may actually need both. In my country, the glass thickness is measured in millimeters, and then the airspace is measured in inches. So I use the imperial thickness gauge for airspace, and then the metric for the glass thickness. When measuring airspace between dual glaze sealed units, Do not measure in the center of the sealed unit as there may be a slight bow causing the airspace to be thinner towards the center of the sealed unit as opposed towards the edge where the spacer bar is. There is a reflection that you will see on the glass when you were looking at a 45° angle in relation to the gauge. The second diagonal line represents the inside pain of the first piece of glass, where that diagonal line crosses the reflected baseline is your airspace thickness. Now for glass thickness, this is where I use the metric gauge, this is super easy just place it out of 45° angle on the glass and look at the reflection. If you're trying to use the Imperial gauge on glass that is measured in millimeters, you're going to get numbers that aren't exact. Same thing if you're trying to use your metric gauge to measure the imperial airspace thickness. I haven't had great success using these on triple glaze sealed units so far just dual glaze and single pain glass thickness. So again, these things are extremely reliable and have worked almost every time 100% ONCE I have learned how to use it. So what's on you to all the bad reviewers! Learn how to use the darn thing.